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The DHW demand light is always on and the boiler lights up when the temperature drops below teh set temperature for the DHW, fires up briefly while the temperature rises and then falls again.. So I think the issue is that the DHW demand is always thought to be on. I'm changing the DHW harness...

the hot water demand is on all the time - it fires up until the water temp reaches the set level then shuts down until has cooled and then fires up again. when there is real DHW demand it works as normal. When I take the hall effect sensor off the inlet pipe it still thinks there is DHW demand...

Yes - you are probably right ! Thanks

I can see that I could buy the wiring bundle (5114780) but seems stupid to have to change a whole bunch of things in one go when all I need to change is one connector

My Combi Gold 33 HE just went into a state where it is indicating hot water demand all the time, so obviously we are getting no CH and the burner is firing up , fan turning on and off every few minutes. I believe this is a problem with the DHW flow sensing function so took the hall effect...